I bought a few UV-C lamps for this very purpose. I'm sorry I can't find the research I found, but it said that UVC does indeed work, but lowers the efficacy suc

I bought a few UV-C lamps for this very purpose. I'm sorry I can't find the research I found, but it said that UVC does indeed work, but lowers the efficacy such that it's not worth it more than 5 times (although, I think'd rather re-use a UVC N-95 mask than make one out of paper towels or a home sewn one). The same research said isopropyl alcohol was a terrible idea as it kills the electrostatic nature of the filter. It said a light bleach solution worked best and could be re-used indefinitely. A DIFFERENT study showed that soaking in a saltwater solution (NaCl) and letting it dry was extremely effective. As droplets hit the micro salt crystals the a very small solution forms, then recrystalizes as it dries. The crystalization essentially rips the virus apart. https://www.businessinsider.com/mask-coated-in-salt-neutralizes-viruses-like-coronavirus-2020-2 https://www.businessinsider.com/mask-coated-in-salt-neutrali... There are some anti-viral masks that use citric acid, AFAICT for the same reason. bulk Citric acid can be bought in the canning aisle at any grocery store as it is needed to make jams. Although I imagine salt is even easier to find http://ryanpharmacy.com/curad-antiviral-face-mask/ http://ryanpharmacy.com/curad-antiviral-face-mask/